Grey Gunk in the radiator

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True Blue Steel Biker
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Grey Gunk in the radiator

Post #1 by Easter » Mon Oct 16, 2017 9:24 pm

Still sorting and fixing teathing issues with "Goldie the Dumpster Gal". Went for a 175 mile run Saturday in advance of the trip to Luckenbach this weekend. Ran great except for a plugged fuel filter at about mile 150. Know the cause of that, but also found a bit of grey gooey stuff at the neck of the radiator filler. Looked a bit like some kind of stop leak or something --which I do not use!! Ever.

Sorry I didn't get a photo but any ideas? Could oil in the water cause this? Otherwise the coolant looked fine. (50/50 yellow Prestone )
Bikes at present:
80 GL1100 Interstate: Now a Cafe Racer called DRAGON WING.
81 GL1100 collecting dust with about 300,000 miles, known as BLACK BEAUTY
2008 (I think) GL1800 Nice bike but as exciting as the family sedan!
76 GL1100 yes, 1100 with 1000 heads and cams, being customized
A fleet of parts bikes awaiting resuscitation or customization or abandonment :IDTS:

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Re: Grey Gunk in the radiator

Post #2 by Wangthang » Tue Oct 17, 2017 7:52 am

I would bet on stop leak. Oil and water don't mix.
1977 Gl 1000
1976 F1 750 SS
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Re: Grey Gunk in the radiator

Post #3 by desertrefugee » Tue Oct 17, 2017 12:17 pm

Sounds like it could also be Dexcool grunge too.
'97 Valkyrie, '79 CBX-Z, '78 GL1000

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Re: Grey Gunk in the radiator

Post #4 by jdvorchak » Wed Oct 18, 2017 7:24 am

+1 on Dexcool gunk. Sop it up with a paper towel. Eventually it will all come out.
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Previous bikes: 84 GL1200 STD, 83 KZ550LTD, 83 CB1000, 78 CB400A, 82 CB900F, 79 CB750K, 2001 GL1800, 2000 Dyna Super Glide, 1972 CB350 K4, 1985 GL1200A, 1997 1200 Sportster, 84 GL1200I, 82 Honda CM400E, 81 Suzuki GS650L, 72 Triumph Bonneville 750, 72 Honda CB350, 66(?) Honda 305 Scrambler, 6? Yamaha yz250, 62 650 Matchless (Norton-Villers).

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